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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b09197728c43f56fd1a7746eda23e771057618c5a4d484406c7544f32df2a48' 
  AND token = '6AmGobjuLcRcu7+gWWWFR2DMKZR5hwfe8Odd/0J4mwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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