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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56f4d7e0096d87c1ae4721406b2b94d226b894279901717303c7ea41c7c5cfb' 
  AND token = 'NiJH5CoD6Ckr5Ehb3QuX7S6z8QtzrcXlEixfBgTgnrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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