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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37633eb222ddaeb178aafe32f1fe444b1ec99b28ab4facd9b6c6291a80e1a6da' 
  AND token = 'rMsw83Dd8/tpNCEAr2yVs4N0CzBISYCk4HGH7WgGuj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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