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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32adfa20573b1307aef81effba74c1748e2f5528e62e8fa0c0ec56d4918d1118' 
  AND token = 'DDOScYgXsXEua6bMzouHxQVb567l/9qthHD0qypWBfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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