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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068507d56a336f90149b05ec71888a25a59c1cc4768d02587c4d4bbd8e44a56a' 
  AND token = 'LE9KtFixFa6fGFNJqeC2PAUhEFIoHqpiM5kHA32XYyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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