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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba485b9c514d98583a06d869b1b806fefd06b324ccac0060f7cadff23b8f664' 
  AND token = 'fHpSPj0QUL77skY7s8MacpKHhl6aYEsgj4qNDF1sfC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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