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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007cb89fa1a2ca72d0fc17b1125555cf71acd19b750679b54fa7945da55859f0' 
  AND token = 'V/oMJzdGWCKGePsQIwVSv8WqpCEws/3iHYfie1SS9cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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