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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c36ed12a4c7433c1e3cfd1c42dfe6f951f40d0fd68b3600da6b4c08fcccb28d' 
  AND token = 'sDuOw4xFY5xk9u35gbsdG4e67794JYA5f2CUa4Ph4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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