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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73152f79c31acd8a25bb86d4762cb4da0e3b810ac309aa9839c7741951e5a94' 
  AND token = 'HHeCMg+cyb4nZqtmLqaasC1q8M43BbeXVmMoKPqU8a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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