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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f514c118b88c78361b077802eae4ebabcd2783b2ffcd4c8cdcf22e3d50d6e1b6' 
  AND token = 'in6iJhl6IqfE1+RUzggfv8826GSWCM4i3ot9KBAVCw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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