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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83137d0b079340e68af3fdecd4c5398f147613223c2282070572bd45863d21d' 
  AND token = 'NqxgCeIowiQa5B2nj34AKFTT3AQzwZAMqTSoJuBa4j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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