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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cacf825317c9f478a752569243c34c133ec49492155096334235c5d962fb8f' 
  AND token = '4tUsl6ZPp9ImLtkTD1KPU/pnfrPsJUDKELgmks+7Lg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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