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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a33d111b6e1accb1641179364b731ca2a688fc15531d84f79272c958e5c7970' 
  AND token = '8gkic/phdk26Z75hr1g0P+n06ioHauTjYBzuvI/Pm1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}