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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997c1bd991f36b23424ef779ca8f5b39c9e9bb225e77e20673be948009adf20f' 
  AND token = 'xc2j8dzPDl2LvHuDTPBT2MOJCzo/fmPUL66bcpwGCJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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