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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a9d6b59ef32dd70e722d88240e3657e14cb4666a3b3e7a512cba0d096e3689' 
  AND token = '/vY13d90HI0mPOL7kTof8Z4EtYz/CXbRYmHOBptTXQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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