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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b98dcc8fb72395f848bf802b7ddf6ce4e7d8ca3a2d6ba4e6edddcfecc92cfd8' 
  AND token = '08J7PlRN+SXlTYJQZSHV09BDt+ksfOHuSGnR/O2Pa8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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