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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889cb8f90d39ef7bd3c4dd4744204b13c7d51ae2dc6acebc947f7deebe2e5e33' 
  AND token = '1ti5mp5mtrvDMm2nCOymyIiRSV8j9D7biSfxeZZMm/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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