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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7255476cfab9fd1d4baa2d0c51583398b36191a844df9f185df45100f38a57b8' 
  AND token = 'xD07zGfUid3IDVjlrEznXf+Ei/9apisxu9UO/L2YtnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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