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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5acc0c4d2972a6efc4bd97198ec1ca215205ca9b8541de8bb4dff12df8e7ed' 
  AND token = 'Wc8Z2OQJzaX5ycxjbX4nt9TviXycDEut9zyoTEw0wI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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