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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8773c0d51ab280f514716ad4e8f686b48050a4dadc608f8917558920dccd60e' 
  AND token = 'bMS9Ld5iKMH6+22n9WfrWmNqugmPiQO9a0FtGOv877c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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