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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94d48c67c3cf6ccdfd515e61fea1740c3cac3d436d311d5ab60399489200844' 
  AND token = 'U7XbX1c7lfZ7jMVUDjKTzXQthnHJFb7pef+tFaZJp6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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