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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bef6e7ff05612469b068aab3ed1f8e121e3f4cc48fc86a237a5bafff481365' 
  AND token = 'W7fI4XPxDuFeVvZ7hjBsscQQUJQX+T0ekbATvpqf1GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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