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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb9b7c0978735273daa9e40c0af52e83edaafd8d5b3fcae91c969b82daf4aa8' 
  AND token = 'joauK8ejQmMLrIiLzxQKxmSWMyPbDvAuu3yupMGg8K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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