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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c26fe10e4a25124d8a208b5a91df5073557ab344d7387d0623baf6377bff0a' 
  AND token = '9F1RhohgeUIlA3TjdBXG7Th2XGD2k6Zey6VZLJOHZB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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