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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef07e8aeadacf0f4654bd348ba4de11cfc1c31bbd73dc5f22f99b86c593f99d3' 
  AND token = 'ZkznHRuC/kQdPqLHU1A1g3tetFNForC5PVsIijPQDGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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