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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db86adf437a73380bf3a4ef003276f70dbc48b81fba90e9ee8c763e818061ee' 
  AND token = 'iuTVhVYyxLHihdty4JPWi40SBJY8SPuP+IYUvYMlvHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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