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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d97f181a237819ea2c8a8db905bbcf8a39af3fa214356ce22e38086a7c36b54' 
  AND token = 'x3OW0otnXgJEb6YlXrbQHHYqTOAK3cvhjfhkl0wJEd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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