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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0352600c8a325dafd6fc1cf25fb6508fe31b21e109326d1690922ff6de7e1d' 
  AND token = 'wh0i2y2aNNIBwa60GfGYH2r1AnvAMFmrC9NNiHQS+Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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