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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18ae440e15847d7a16b9226e2eb8278d82c64a40cd61f3bba07372d7e34db5b' 
  AND token = '2gW+2kPb5EV3UZGNLfxErM4ZegDR2oFbLAznE04GW28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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