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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802ac01702ff0bdaa79f5acc1d4158183b8df030da5641ff4cda31749862a3dc' 
  AND token = '6BCVW+LQuGmq+Hal3++zNb83HUD+XpNQG920CWY51+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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