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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5a80e09c22016df417c36640af08ce14f13326fbfa248e308d6e71416fc6eb' 
  AND token = '8FvsMxc0LU9J3IIO2oIP0OIdQoK/YbsmjqLYG3LRR7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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