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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66393a0d58365a1ba9949e8371b770652f2ee41488749dd2c4b0d2f385c13aa8' 
  AND token = '6a2/nQ4gaaT8/JEVLICVMNV+0SBk6FRyzW6wMJ4MvCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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