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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc3b6b0c112c454f99171947b7c031d41d07936b2c5b7723aa7076f3a22dc8e' 
  AND token = 'BdJiaA9iaUCFF+HxHh34i5hwNheilQ2h87y3ILQS8bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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