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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92768368a23925acd8629ac12b00b60337384db3d74b1e494cd0793ff48bace1' 
  AND token = 'v98uhvUZ1lDUKWJ48ZAErIJ7J83GBXOJ3Mba/jNhxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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