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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a63a368e1f8c99ca75b4602b8aa63c90fd93039e61aa3f453876dd257ecb6c' 
  AND token = 'rs/xaP1t6WoUq8gx8Ni1HqrNaUi/M2jqolo/UeqmgmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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