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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ca5e836791af0579321183a8786e440c85872e0a66710638d4a21bd713e6f2' 
  AND token = 'eDBql1hCbkAA817eGH7C3zk+kgzgeFx/hLi44eVwxz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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