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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40a87bcfe3f5f7d1fea1fcab417ad82ec2a69189c9de74edf1d53ef6ef558c1' 
  AND token = 'fkG/fM/8RJHyuZRARUXq2DdiV5L6aAXpF/NXbeaJDuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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