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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e434fb2c7f980b5d59ca63562e466eacec659d13d1f098a5e6fada4f75d58d8f' 
  AND token = '1iSHK8Udzcy9jM9XxTBJjCrJkImt1yiO6cXEit/RmfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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