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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971a9deb93c6ae0e983f1016cc8031e8cb4c0223f86731d44a6683da228dec28' 
  AND token = 'TrHQ28GcgoJB1ZazgIhP0Dx9yLLB9KLEPw59+Uvjgm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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