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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd476b43d30773c641d3aba53afbc2e8a19185f082f105fb6a7a2b0eee6602d8c' 
  AND token = 'XN2tvxUlSJymlXFG5rDKiRLr2sn4PrO0lSnE99JH+F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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