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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adb01a4d69ab74d88d0c0f1e6684b199e9dca7dc1c1d4665f77219a96003391' 
  AND token = '+7k47DWNt7inplC3gn2uxXV/0qBqRuFh+qPJVEg49n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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