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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c5ea75a7e68f9ba5462b45d4eb93a4297e0309365a2feaaf385e4e88ada6ae' 
  AND token = 'XiGnMtpFBlYc8o0qcMwOjTBDmaRy+kr/yr1gEKui8y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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