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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a634c8bd5d53a72f20d36283bed3488caae5f6613dc7385fd903d123c5b066' 
  AND token = 'mNc84n3m5w2gBB8GlLxMZLAhgXaxSDR0lxytKh/RUEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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