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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60a29bc0bd5055952f51e00e89dbbb8336465daa6ef81f19d09d7cfeec01406' 
  AND token = '02I6glW8nZQi+sfuJnE/kUZSHWo446o6A1WbQLl2lxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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