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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c53422f1b82ced964afdd9fa2c025e03963d7cab68b42f97f3ef76c5095c0cf' 
  AND token = 'YQ4/7WctCFINfZ40Z730Jt6HjBy52UY1Ekign3LyzJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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