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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9f7ac5c4800c1cdf5e1c61de2ec1cb44f7c3e99ba720bea825ddc031b10536' 
  AND token = 'q98Am95toJyFghzFsGnDEEwN7uYU01jkEx32uMaRNUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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