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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12b505848c8340455d153ef3c772cda9662f6e9abfb9737aa61479d1dbd3082' 
  AND token = 'kXeom/sArQRhpOYoBrBTYNtc+LCRvz34xIdePIoom1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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