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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e0321bdb2673e11c8681584308f4723e0798d104c58e9b92fa1db4f306740f' 
  AND token = 'JdWEXmIXN7P9n9qNo7VS6nckLXGWL1WBJtvbK84LQZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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