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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1b886299d943c3b6467898c76cfe3a92a33d67de8aa3ecd216bb2ffcd246a4' 
  AND token = 'RBeEZY3k7N89l7J2XpNsZpKdQtf7P2tZrQFvkPzTq4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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