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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df808dfd20b74254639e3ccfa6a0d2143ea39635485f2d47238cff2bd7e9b94' 
  AND token = 'RarGPJJnWMdK70PIGf3b7cMxiHpEVvE6GGHgqiHvTs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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