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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065d81c2b782c3beb0551d6363cc4333db5bb8f6f65d99c9a8575eb1ef273390' 
  AND token = 'i7Y2qEZoCTKAZoCvcQc/k8YzRkGG8wfz9OqBRQSvB9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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