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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18470d1aac6d99859a1fd35f99c0d2b0647602e8a4b802657d7586ef93980656' 
  AND token = 'ZB0lzzFA+14haz4MU6+X+yXw4VAO78oOhDISmGpAlJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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