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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796888789c236add6bf6f0e1cf30af7e74bfd1900645fb6f847fb2087b8c6b4' 
  AND token = 'EkiQB1tgJ1y50JCP3rqHUYL4m+g0TscVUunsX5yvnCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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