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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab028cb5070c1845604a4bd13b21edb65a931431befa2a8ec12fa630ec1120' 
  AND token = 'ypc2IWmuCBi3Ja+68nUHL4zXpPvXQsSkvFBEu3s27ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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