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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba0ebc0dc73bb791d291cb4fe5aca95512720951fe7b99d9237566d445c9120' 
  AND token = 'n/CU5GutAYtqN2y+e7C48RFGiZ0O1jgD87Qt169nppU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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