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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c110994bce554a4351824a6b89487186454f5ecc28e37400e9a7f81fc42a4b' 
  AND token = 'qNv3BNU48xv6y0AT8UkQM6h9PgK6BR4Ts/h6SO/xMnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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