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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a4022821e75eaf3e4593d4c83d0ee0cbd9b8ff42816cc0eb1c2dc395efa9ef' 
  AND token = '3bUbbFYANesiR6Y18NtoGmauPK/fBX5KEjoj82FnG1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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