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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691fca5a73ccc8029dc76d2728a76988cfc32b4d9d21349faf631f2ae6bc230a' 
  AND token = 'rT+moCTRjVmUZLZvnucytuwc+Yyf+ATvePtr2/zsV74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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