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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960e30bfc7c129f3b4ce4e053bbac154c4c7d48f7c9f0d9e2d02fc3c95d7de73' 
  AND token = 'RXuYZhCyI1AKfcr839nSlO09JKEKSVvfwXs0nb3OCMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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