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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903225b81bbcdba3e96e175bd8524d1605586882ae5b50065ce9fc0bac01379a' 
  AND token = 'tmE2wtd8YTIZBbodK09ZU9kSyCRLP1UW+L4+heakGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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