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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31946dc4f74d5093b7ef5c3cad1635c192573c2abe19c0d543dedc318e8f9c1' 
  AND token = 'c01svlV+rKTiFY1jcj+9k72tePZ2TR6ph+eyPiJ23Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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