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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762103351871d61e7f2db41fec64af07e2ac6f20fbaba8c85f4a5962ec55994c' 
  AND token = 'wcPfzvPj46nsyqEJwQWHQQUpAj/WmNzJ3sIFnaF2WUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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