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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf57092770b508bb8aacd2dcb6c06e4379166f4a65982ba1c072404528fc937a' 
  AND token = 'nLvXm4b9m8bmIAF6v6gXOxuyYzk2D4uTcig4xqdgVBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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