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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd04a42bcc4004571336e79952ca91d4b55abd27b214341baa688ae4a525a42' 
  AND token = 'hIRrOAG668rQunlHPuKjiC9nJAgGy4BgcO+AhoYuE2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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