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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968b08ff6b14285a8e140c930d71a00316fff6eed2e13a9f89e775b83df34646' 
  AND token = 'YdubegAfleEVr3HpOVHxUB+cSMzM+Y9BVW3jsvPIFVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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