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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc323bf6ba6ad05e8fdce90cc0fc5cbe8c048269b540ee3d3e7769cfc360833' 
  AND token = 'T3UVPuSMitqhBXMJwoPvCcvJDp2XuE9d2z0YV+/2yCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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