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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b4be46662369bebc094493845c35d804c1b00f71d85b6739a83211785cec00' 
  AND token = 'Stlsq6GgRPGNXywqODrwL733cUdPLZ7NDhP4bxYIQIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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