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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05d060a1603d7e43c685dc02ad40bf18cde977f239f2c250176a34207e08603' 
  AND token = 'ssRoVUH15c/YegrauBqznzw4hRX2Js6Eb7mAteZ4q2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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