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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaec2a8c8c12217761c31aab6dbb084d8ebb2bc6bb8f5353af6bd759239abfee' 
  AND token = 'U0RXwyeFyGFfHtivjA8W+ykMccJC4mclPARKTamlvEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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