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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33289d5f5e361880bad286289ea01891177f6e807188e199a32cf22480cc18db' 
  AND token = 'dMfMxlqc3TJ8fwUpxjCQC33X5Z2CVYWcf+GMxgbdK1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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