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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff883bf09b8d5651a464cde40b1c149db955a5f2a5e08c0fee1efcbae948bcd1' 
  AND token = 'bZDi8U0fHCCFmoD3sac42Ews10jL3JW/IqDLJ4lrhD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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