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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5040e695e5988741cb16a51fad984003f9c8264f0963b1c4d532f5a19d3b50a0' 
  AND token = 'muSZ9j0t2XxBKfOfVr5z4euYu3gVraAZaQIqW7Ydapo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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