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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6677321bd91dc7b804d32cd0bfe6a89c538480f7e6a91411a24f0058fa15fa' 
  AND token = 'Nz8TzLre8ZddP1w1rJNJLK3WM6OlYZf0RceBEIURZVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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