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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0669d3afdbcb326b7faf7051dcc1f689c9a1e38b0fc535506b2ffc6a195ba72d' 
  AND token = 'iRXIaYxncaIoKGw5cW+3MbHCzGz2Q3mhMoFwUzju6IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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