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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501ae6b2df14d0fce8049885f0c594e09c9df3f197273aaabc5df6e449b017e4' 
  AND token = 'rZWp0w7JcyU3cMlK3yWc81WxJ83pCVw8j1VAjgg6ofI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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