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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b813b2164d36da4d768a0fc9071a03b0e38943bd87baff973c41407fc6c5df5' 
  AND token = 'Kjc6Dq/bzBgRNJoPAlbADcNZuR8pxbnylcYve22mCm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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